I have only seen Sin Rubeo Amniculus in graphic
novels #16 and #17.
What I do know is that he rushed too the battle
in New York between Guyver, Aptom and Pulkshterl.
He is good friends with Pulukshterl when he
heard about the battle in New York he got off the plane to fly to Pulukshterl.
When he arrived Pulukshterl was dead. He had a giant
impact hole in his chest.
Amniculus was deeply sadend by this but he also
knew that one of the other Zoalords were responsible for the death od Pulukshterl.